The Microsoft Drivers for PHP for SQL Server are PHP extensions that allow for the reading and writing of SQL Server data from within PHP scripts. The SQLSRV extension provides a procedural interface while the PDO_SQLSRV extension implements PDO for accessing data in all editions of SQL Server 2008 R2 and later (including Azure SQL DB). These drivers rely on the Microsoft ODBC Driver for SQL Server to handle the low-level communication with SQL Server.
*This package contains only the PDO_SQLSRV driver.*

[Added]
- Added support for Always Encrypted with basic CRUD functionalities (see [here](https://github.com/Microsoft/msphpsql/wiki/Features#aebindparam))
- Support for Windows Certificate Store (use connection keyword ColumnEncryption)
- Support for custom key store provider (use connection keywords ColumnEncryption, CEKeystoreProvider, CEKeystoreName, CEKeystoreEncryptKey)
- Support for inserting into an encrypted column
- Support for fetching from an encrypted column
- Added support for MSODBC 17 preview
- Added Driver option to set the ODBC driver, Added"Driver" option, valid values are ODBC Driver 13 for SQL Server,ODBC Driver 11 for SQL Server, and ODBC Driver 17 for SQL Server
- If the user intends to use the new Always Encrypted features, we recommend you to specify explicitly the 'Driver' option to 'ODBC Driver 17 for SQL Server' in the connection string
[Limitation]
- Always Encrypted functionalities are only supported using [MSODBC 17 preview](https://github.com/Microsoft/msphpsql/tree/dev/ODBC%2017%20binaries%20preview)
- ODBC binaries for macOS available upon request
- MSODBC 17 preview msodbcsql.msi only works for Windows10
- [Always Encrypted limitations](https://github.com/Microsoft/msphpsql/wiki/Features#aelimitation)
- when using sqlsrv_query with Always Encrypted feature, SQL type has to be specified for each input (see [here](https://github.com/Microsoft/msphpsql/wiki/Features#aebindparam))
- No support for inout / output params when using sql_variant type
[Known Issues]
- Connection pooling on Linux doesn't work properly if the user uses the MSODBC17 preview
- PDO::quote returns truncated string with garbage characters appended if the string contains a ASCII NUL ('/0') character
- When pooling is enabled in Linux or MAC
- unixODBC 2.3.4 or prior (Linux and MAC) might not return proper diagnostics information, such as error messages, warnings and informative messages
- due to this unixODBC bug, fetch large data (such as xml, binary) as streams as a workaround. See the examples (https://github.com/Microsoft/msphpsql/wiki/Connection-Pooling-on-Linux-and-Mac)